BBO-3B II

By using a type II BBO crystal instead of a type I BBO crystal, the BBO-3B II gives a consistently narrow bandwidth over the same tuning range as the BBO-3B I while maintaining the simple design of the BBO-3B I and high efficiency. The efficiency for doubling the narrow band-width output of this OPO is as high as 45%.

Photoacoustic spectrum of ammonia taken with the BBO-3B II with 5mJ energy in the 1.9mm region.

Power Spectrum of the BBO-3B II, pumped by 145mJ at 355nm. The pump laser is a Spectra-Physics GCR-16 Nd:YAG laser operating in single frequency mode. SHG covering 208nm to 415nm is achieved with three BBO crystals.

Physical Layout:

Same as BBO-3B I, could be upgraded from BBO-3B I by changing the modularized tuning block.